Granted Patent
Utility
US 4,926,409 · App. 07/242,368
Optical permitting record/playback from both sides of an optical disk
Inventors:
Hiroshi Tsuyuguchi, Kenji Shimozawa, Takashi Kamisaka
Patented Case
View Patent ↗
Granted: May 15, 1990
Filed: Sep 9, 1988
Inventors
Hiroshi Tsuyuguchi
Kenji Shimozawa
Takashi Kamisaka
Assignee (at issue)
TEAC CORPORATION
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.